I had to upgrade to a newer Mac, circa 2011. The older MacBook I had couldn’t upgrade to 10.10+ as it was the first machine to use the intel chips. Rosetta (Apples’s interpreter between Motorola and Intel chips) was no longer supported after os 10.6.8. Could not run easel on either Firefox or Safari. Now run easel on Safari, operating system on newer machine is 10.13.